One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,13)(8,12)(9,11)(10,15)(14,20)(16,18)(17,19)(21,22,26,32)(23,30,24,28)(25,31,27,29)(33,36,34,35)(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,23)(22,28)(24,26)(25,34)(27,33)(29,35)(30,32)(31,36)(2,4)(22,29)(25,27)(28,35)(30,36)(31,32)(33,34) involution — undirected(6,11)(10,13)(12,19)(18,20)(21,24,26,23)(22,30,32,28)(25,33,27,34)(29,36,31,35)(2,4)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(21,25,26,27)(22,31,32,29)(23,33,24,34)(28,35,30,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.